Composition of matter for paving, &amp;c., and process of forming same.



UNITED STATES PATENT OFFICE.

WILLIAM J. BURKE, OF SCRANTON, PENNSYLVANIA.

COMPOSlTlON F MATTER FOR PAVING, do, AND PROCESS OF FORMING SAME.

SPECIFICATION forming part of Letters Patent No. 629,766, dated August1, 1899. Application filed February 24,1898- Serial No. 671,530. (Nospecimens.)

To all whom it may concern:

Be it known that 1, WILLIAM J. BURKE, a citizen of the United States ofAmerica, residing at Scranton, in the county of Lackawanna, in the Stateof Pennsylvania, have invented certain new and useful Improvements inGompositions of Matter for Paving and other Purposes and Processes ofForming the Same, of which the following is a specification.

The composition consists of the following ingredients, viz:impalpablypowdered anthracite coal, thirty seven and one half pounds;pitch, twenty-five pounds; dead-oil, twenty-five pounds, and resintwelve and onehalf pounds.

, The process of mixing the above ingredients is as follows: I firstheat the powdered anthracite in an iron vessel having a loose cover 1 orthe egress of gas or vapor. The anthracite is heated to about 150 or 200Fahrenheit, and the heat is kept up until the mass is evenly heatedthroughout. The pitch, deadoil, and resin are placed in a'suitablevessel and heated to boiling-point and stirred until thoroughly mixed. Ithen add the heated impalpably powdered anthracite and stir the massuntil it is thoroughly mixed, the heat being continued during such-mixing, and the mass will be brought to a high boiling-point. Theboiling will be continued until I find by testing that the compositionis ready for running off into barrels or molds, where it will harden. Aproper test will be to drop some of the composition on'a cold surface,and when it hardens rapidly thereon it will be ready.

The above-described composition may now be remelted and used in fillingthe cracks between paving-blocks or bricks and for varis other purposes.1 Where the composition is to be used for making paving or-buildingblocks, surfacing streets, or forming the bed of a roadway, &c.,

the proportion of anthracite dust is increased to about sixty or seventypounds, and the other ingredients are reduced in proportion. The processof mixing is the same as that above described, and the heated mass,which is in a somewhat granular form, maybe carried to the place of useand there applied as a surfacing for roadways, &c., by means of rollers,smoothing-irons, &c., after the manner of laying sheet-asphalt, or itmay be compressed by suitable molds into blocksor articles forvarious-uses.

The powdered anthracite used is the coaldust or impalpable powder whichaccumulates in large quantities at coal crushing or breaking machines,and what I term deadoil is otherwise known as gas-tar. 4

The above -described filling composition will form when reheated abinder which will so firmly unite the bricks or paving-blocks that itwill be very dificult to break them apart at the joint. At least I haveso found it when used as a filling for vitrified bricks.

The tensile strength of such filler or hinder I found to be threehundred and sixty pounds, while the other form of the compositiondeveloped a tensile strength of six hundred and seventy pounds, and Ifind that both forms of the composition are not in j uriously afiectedby frost or moisture or by any changes in atmospheric temperature, and,owing to the high degree of heatemployed in manufacturing thecompositions, they will withstand a great amount if subjected thereto.

A further advantage of .the composition is its comparative cheapness,since the coal-dust and dead-oil or gas-tar are both waste products.

What I claim is 1. The herein-described composition-for paving andbuilding purposes, consisting of impalpably-powdered anthracite coal forthe base,and an oleaginous resinous binder there for; in substantiallythe proportions stated,

and thoroughly mixed together and united by heat.

2. The herein-described composition of matter, consisting, in coal-dust,pitch, dead-oil, and resin, in substantially the proportions stated; thesame being thoroughly mixed together and united by heat, substantiallyas and for the purposes set forth.

3. The herein-described process of forming a composition for thepurposes stated, consisting in heating coal-dust in a suitablerecepta'cle, then melting together in a separate receptacle, pitch,dead-oil and resin, then adding the heated coal-dust to the meltedmixture during the continuance of the heat and bringing the mass to theboiling-point, substantially as and for the purposes set forth.

4. The herein-described process of forming blocks for paving andbuilding purposes, the same consisting in heating coal-dust in asuitable vessel, then melting together pitch, deadoil, and resin in asecond vessel orreceptacle,

then mixing therewith the heated coal-dust and bringing the mass to theboiling-point and finally molding the composition in suitable molds,substantially as and for the purpose set forth.

In testimony whereof I affix my signature in presence of two Witnesses.

\VILLIAM J. BURKE. WVitnesses SoLoN C. KEMON, GEO. H. EVANS.

